Divided bond for two-membered concrete building-blocks.



L. B. LARSEN. mvmm) 130m) :03 TWO MEMBERED CONCRETE BUILDING BLOCKS.

APPLICATION FILED I'BB. 17,1908.

903 ,734. Patented Nov. 10, 1908.

UNITED STATES- PATENT OFFICE.

LUDWIG B. LARSEN,

OF PORTLAND, OREGON, ASSIGNOR OF ONE-HALF TO WILKIE C. DUN IWAY, OF PORTLAND, OREGON.

' DIVIDED BOND FOR TWO-JEEMBERED CONCRETE BUILDING-BLOCKS.

Specification of Letters Patent.

fatented Nov. 10,1908.

Application filed February '17, 1908. Serial No. 116,405.

tion, reference being had to the accompanyin drawings as constituting a part thereof. 1115' invention relates to the present well known system of two-membered construe-- tion of'co'ncrete building blocks, comprising a block madein two pieces, saidpieces sepa-.

rated from each other so as to leave an intermediate air-passage and integrally united by metallic bonds; and my present invention has for its object to so arrange the bonds as to adapt the two members of the concrete block to be kept-separated until put together for use in construction work; in other words,

making the bonds divided, each of the'two' members. of the concrete block having one of the portions of the divided bond, and the parts being arranged so that. they can be readily and securely put together in the process of construction. The advantage ob- I viously gained by this method is, that the blocks are handier to. transport, and easier to handle when placing the same, in position, in the process of "construction work, si'n'ce :only one-half of the weight of the whole block has to be handled at 'a time. Also, blocks of my present type of improvement arehandier to'set up; and the wall thereby built-can be made wider or narrower as expsdient; for example, the same blocks may.

made wide in the foundation courses and narrower in the superstructure. Furthermore, m improved method provides for the tying o the blocks together attheir abuttmg ends.

I attain my object by the arrangement and combination of parts as illustrated in the drawingsabove referred to and hereinafter fully described and claimed." 1

with my present improvement and united and Figs. 5 and 6 are details of construction end to end;'Fig. 3 is an end elevation corresponding with Fig. 2; Fig. 4: shows a corner section of a building-block of the type referred to, embodying my improvements;

more fully described in the body of this specification.

The letters designate .the parts described.

As already mentioned, in the introduction of this specification, each of my blocks comprises two companion members a, a, which are arrangedin spaced parallel relation, and are of approximately duplicate construction. Each-of said members is provided with one part 'of the. divided bond, as represented by the members b, c, d, e, (and their counterparts, as b, d) approximately arranged at an angle of forty-five degrees, so that when united the bond-parts b, c and the members a, and the bond-parts d, e of the companion members a will come togetherand overlap, as illustrated in Figs. 2 and 3; and said overlapping ends are provided with perforations f, through which to insert bolts g.

Preferably-I provide said-lapping ends of the members of the dividedbond with additional perforations f, so disposed as to allow the companion members of a concrete block to be arranged closer together if de-" sired.

' In-the construction of corner blocks, as;

illustrated in Fig.4, the members it, i, 3', 1c of the divided bonds projecting from the I ends of thecompanion block-members are arranged at an angle, while the members Z, m of the intermediate divided bond are-so arranged that when put together they will constitute a transversely positioned bond, as-

illustrated in Fig. 4. The detail for constructing the transversely arranged bond is The portions of the divided bond which are embedded in the ends of the blocksare made as illustrated in Fig. 5, consisting of a body portion q, made of a strip of metal, the extremities of which are bent over into ansystem of construction, means are provided I 'not only for firmly uniting the two members of a two-part concrete block, but also for uniting the abutting ends of the individual blocks of a course.

I claim:

1. A block comprising two members, a bond for uniting said members and maintaining them in spaced relation, said bond comprising two sections, each including a bar having its ends bent substantially at right angles to the body of the bar, the body of each bar being transversely embedded in one of the block members near the end there of, with the right angular end projecting toward the adjacent block member, and means to secure the terminals of the angular ends of the respective sections in overlapped relation.

2. A wall made up of a series of blocks arranged end to end, each of said blocks comprising two members and a bond for uniting said members and maintaining them in spaced relation, said bond comprising duplicate sections arranged adjacent the respective ends of each member, each of said bond sect-ions being in part embedded in a member and in part projecting from the member toward the opposing member, the projecting part of each bond section extending beyond the proximate end of the member, whereby to provide for bonding the respective members of each block and also fortying the adjacent blocks together.

3., A. block member forming part of a building block and metallic sections secured 1n said member, each of said sections comrisin a bar havin its ends bent at 'sub-.

stantially right angles to the body of the bar, the body of each bar being embedded in the member near the respective ends of the latter, the ends of the bar being projected beyond the inner surface of the member and at an incline to such surface, whereby to dispose the terminals of said ends beyond the proximate ends of the member.

LUDWIG erases Witnesses:

W. A. CLELAND, T. J. GEISLER. 

